The colours of concrete as seen by X-rays and neutrons. (November 2019)

• Record Type: Journal Article
• Authors: Roubin, Emmanuel; Andò, Edward; Roux, Stéphane
• Is Part Of: Cement & concrete composites. Volume 104(2019)
• Publication Date: 2019-11
• Subjects: Concrete microstructure -- X-ray computed tomography -- Neutron tomography -- Digital volume correlation -- Multimodal imaging; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2019.103336
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: Both x-ray tomography and neutron tomography give very detailed insight in the microstructure of concrete. However, their different contrasts, due to different compositional sensitivities, make one modality more relevant for some features. The present study shows that both types of images acquired on the same specimen may be registered onto each other, after the statistical joint distribution of absorption coefficients has been learned. A Gaussian mixture model has been used to identify up to five different phases having different signatures. A staggered algorithm consisting in i) adjusting the joint histogram to fit phases and their variances and ii) registering the two 3D images onto each other, within a multi-scale algorithm is presented in details. The analysed experimental data illustrates the benefit of using jointly both modalities as compared to their parallel usage.